Ncstar tube-style sights with a safe led red dot have a 30mm objective and a black anodized aluminum body.This unit features a seven-position rheostat knob for multiple brightness settings.These red dot sights come with a battery, lens covers, mounting tool and integrated weaver-style mount.Battery: CR2032Magnification: 1xObjective: 30mmField Of View: UnlimitedEye Relief: UnlimitedDot Size: 3 MOALength: 4.50"Weight: 6.80 ozFinish: Black AnodizedReticle: Illuminated Red DotAdjustment Size: 1 MOAProofs: Weather ResistantOptic Coating: RubyWindage Elevation: Adjustable